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45 lines
903 B
45 lines
903 B
#include <ctype.h>
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#include <stdio.h>
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#define SIZE 100
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int getfloat(double *pf) {
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int c, sign, dec;
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while (isspace(c = getchar())) /* ignore whitespace */
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;
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if (c != EOF && c != '.' && c != '+' && c != '-' && !isdigit(c)) {
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ungetc(c, stdin); // not a number
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return c;
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}
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sign = (c == '-') ? -1 : 1;
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if (c == '+' || c == '-')
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c = getchar();
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for (*pf = 0; isdigit(c); c = getchar()) {
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*pf = 10 * *pf + (c - '0');
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}
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if (c != '.' && c != EOF) {
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ungetc(c, stdin); // not a number after decimal
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return c;
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}
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if (c == '.') {
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c = getchar();
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for (dec = 1; isdigit(c); c = getchar(), dec++)
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*pf = *pf + (double)(c - '0') / (10 * dec);
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}
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*pf *= sign;
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if (c != EOF)
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ungetc(c, stdin);
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return c;
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}
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int main() {
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int n;
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double array[SIZE];
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for (n = 0; n < SIZE && getfloat(&array[n]) != EOF; n++)
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;
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printf("%lf", array[0]);
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}
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